CN1897410A - Rotary electric machine - Google Patents

Abstract

The present invention provided a rotary electric machine capable of operating efficiently while keeping a good productivity that is an advantage of concentrated winding. A rotary electric machine includes a stator 1 in which a coil 4 is wound around a plurality of teeth 5 through a concentrated winding, and the coil 4 is connected to a three-phase power supply, a rotor 2 disposed opposite to the teeth 5 of the stator 1, wherein a ratio of the number of poles to the number of slots of the stator 1 is 1:3. Consequently, harmonic component of magnetmotive force close to fundamental wave is eliminated, and thus a rotary electric machine can be operated efficiently. Also, a rotary electric machine can be provided with a small coil end, a high volume productivity, a high space factor and a good productivity by adopting a stator of a concentrated winding approach.

Description

Electric rotating machine

Technical field

The present invention relates to electric rotating machine, particularly relate to electric rotating machine with stator of implementing concentrated canoe coiling.

Background technology

In the past, the stator of three phase induction motor was implemented the coiling of distribution canoe.On the other hand, concerning permanent-magnet motor, using the stator of implementing the coiling of concentrating canoe mostly.Concentrate to twine stator and be not both, twine the stator, in the magnetomotive force waveform, near the frequency the first-harmonic, have anti-phase (point to opposite to) magnetic flux with direction of rotation concerning concentrating with the maximum of twining stator that distributes.This flows through electric current for making in primary side by the magnetic flux that is produced by stator, thereby produces the induction motor of the type of magnetic flux, the pulsation (fluctuation (ripple)) of torque occurs producing, power factor shortcoming such as degenerate.Yet, concerning concentrate twining stator, produce the characteristic height in batches, coil-end is little, the high main advantage relevant with productivity of occupation efficiency is many.

Under above such background, up to the present mostly consider the concentrated windingization of induction electric machine stator.For example, have stator is made of divided a plurality of stator vertically, relatively another is cut apart the stator deviation angle β that along the circumferential direction only staggers and is configured to cut apart stator by one, and each tooth of cutting apart stator is twined the coil of stator winding, eliminates the situation of above-mentioned anti-phase magnetic flux.(for example, referring to patent documentation 1).

[patent documentation 1] spy opens flat 7-298578 number

Summary of the invention

But, in the method for above-mentioned patent documentation 1, at axial middle body coil-end must be arranged, thereby be reduced half as the little such strong point of coil-end of concentrating the canoe advantage.In addition, with regard to shape, there is coil-end to become big situation compared with the distribution canoe.That is to say, can not effectively utilize the advantage of concentrating canoe.This problem is remarkable especially on the little motor of cumulative thickness.

The present invention makes for solving above-mentioned existing problem, provides a kind of and can keep as the good industry characteristics of concentrating the canoe advantage, can remove again near the magnetomotive force high order harmonic component of first-harmonic and the electric rotating machine of running expeditiously.

Electric rotating machine of the present invention is characterized in that having: stator, and this stator is with concentrated canoe winding around on a plurality of teeth, and coil is connected with three phase mains; Rotor, this rotor cover is configured the tooth of stator, and wherein, the number of poles of stator is 1: 3 with the ratio of groove number.

According to electric rotating machine of the present invention, by the ratio of setting stator poles and groove number canoe in 1: 3 the three-phase set, the magnetomotive force high order harmonic component near first-harmonic is disappeared, thereby can turn round electric rotating machine expeditiously.In addition, by setting the stator of concentrating canoe, can provide coil-end little, produce characteristic height, the good electric rotating machine of productivity that occupation efficiency is high in batches.

Description of drawings

Fig. 1 is the drawing in side sectional elevation of 4 utmost points, the 12 groove electric rotating machines of expression embodiment of the present invention 1.

Fig. 2 is the drawing in side sectional elevation of stator winding of 4 utmost points, the 12 groove electric rotating machines of expression embodiment of the present invention 1.

Fig. 3 is the drawing in side sectional elevation of 6 utmost points, the 18 groove electric rotating machines of expression embodiment of the present invention 1.

Fig. 4 is the drawing in side sectional elevation of stator winding of 6 utmost points, the 18 groove electric rotating machines of expression embodiment of the present invention 1.

Fig. 5 is the scope of application figure of 4 utmost points, the 12 groove electric rotating machines of expression embodiment of the present invention 2.

Fig. 6 is the scope of application figure of 6 utmost points, the 18 groove electric rotating machines of expression embodiment of the present invention 2.

Fig. 7 is the rotary motor rotor sectional arrangement drawing of expression embodiment of the present invention 3.

Fig. 8 is the rotary motor rotor sectional arrangement drawing of expression embodiment of the present invention 4.

Fig. 9 is the rotary motor rotor sectional arrangement drawing of expression embodiment of the present invention 5.

Figure 10 is the rotary motor rotor sectional arrangement drawing of expression embodiment of the present invention 6.

Figure 11 is the schematic diagram of high order harmonic component loss of the electric rotating machine of expression embodiment of the present invention 7.

Embodiment

Below, illustrate with reference to the accompanying drawings to be used to implement preferred forms of the present invention.

Execution mode 1

Fig. 1 is the profile that twines induction motor in the electric rotating machine, particularly three-phase set of expression embodiment of the present invention 1.In Fig. 1, twine induction motor 100 in the three-phase set and constitute by stator 1, rotor 2.Stator 1 is with the iron core of mades such as stacked electromagnetic steel plate (core back) 3 and concentrates the sectoral integration of winding around 4 to make on the tooth 5 of mades such as same stacked electromagnetic steel plate.As shown in Figure 2, being wrapped in coil 4 on each tooth 5 connects with three phase mains (U mutually, V phase, W phase) respectively and is wound and line to form the rotating magnetic field mode.

Rotor 2 have with the rotor core 7 of mades such as stacked electromagnetic steel plate and be arranged in rotor core 7, form the secondary conductor (secondaryconductor) 8 that forms with aluminum casting method etc. with groove in secondary conductor, this rotor 2 is made into by rotating shaft 9.This secondary conductor 8 constitutes end ring (not shown) at the last part two ends of cumulative thickness direction usually

2 of stator 1 of Zhi Zuoing and rotors by integrated, twine induction motor thereby form to concentrate across space 6 like this.

Here consider to be generally used for the distribution winding magnetomotive force that stator produced of three phase induction motor.The groove number of every extremely every phase shown in the table 1 is that magnetomotive high order harmonic component composition that stator produced is twined in 3 o'clock distribution.Several 3 expressions of the groove of every extremely every phase are if 2 utmost point stators then have 18 grooves, if 4 utmost point stators then have the meaning of 36 grooves.In the table 1 first-harmonic is recited as 100%.By table 1 as seen, for magnetomotive first-harmonic, high order harmonic component is less, and only at 5 times, 7 subharmonic can be seen.

Table 1

Number of times	The high order harmonic component composition is with respect to the ratio of first-harmonic
		First-harmonic	100％
2 times	0％
		3 times	0％
4 times	0％
		5 times	4.7％
6 times	0％
		7 times	2.8％
8 times	0％
		9 times	0％
10 times	0％

Equally, table 2 illustrate the groove number of every extremely every phase be 2 and 1 o'clock distribution twine the magnetomotive force high order harmonic component composition that stator produced.The result of table 1 also is logged in the table 2.All magnetomotive first-harmonic composition that each stator produced is recited as 100% in any case.With table 1 relatively, though along with every extremely every phase groove number reduces, 5 times, the composition of 7 subharmonic increase, the number of times of the high order harmonic component that produces is identical.

Table 2

Number of times	The high order harmonic component composition is with respect to the ratio of first-harmonic
				Every extremely every phase groove number is 1	Every extremely every phase groove number is 2	Every extremely every phase groove number is 3
	First-harmonic	100％	100％				100％
2 times				0％	0％	0％
	3 times	0％	0％				0％
4 times				0％	0％	0％
	5 times	20.6％	5.5％				4.7％
6 times				0％	0％	0％
	7 times	15.2％	4.1％				2.8％
8 times				0％	0％	0％
	9 times	0％	0％				0％
10 times				0％	0％	0％

Consider to be used to the magnetomotive force that the concentrated winding stator of permanent-magnet motor is produced below more.Many use base units are the stator of 2 utmost points, 3 grooves in permanent-magnet motor.So-called base unit is that 2 utmost points, 3 grooves are that expression is if 4 utmost points then are 6 grooves, if 6 utmost points then are the meaning of 9 grooves.It is magnetomotive high order harmonic component composition that the concentrated winding stator of 2 utmost points, 3 grooves is produced that table 3 illustrates base unit.Here produced in the distribution shown in the table 2 and twined 2 times, the 4 inferior magnetomotive force of not seeing in the stator.These 2 magnetomotive force are the magnetomotive force that act on the direction opposite with first-harmonic, are called as the anti-phase magnetomotive force.Because this anti-phase magnetomotive force is to exist on the frequency near first-harmonic, so induction motor can not efficiently rotate.It mainly is to have influences such as the pulsation (fluctuation), the power that have produced torque degenerate.

Table 3

Number of times	The high order harmonic component composition is with respect to the ratio of first-harmonic
		First-harmonic	100％
2 times	50.2％
		3 times	0％
4 times	25.5％
		5 times	20.6％
6 times	0％
		7 times	15.2％
8 times	13.6％
		9 times	0％
10 times	11.4％

By above result, because on induction motor with the winding stator that distributes, not with the anti-phase magnetomotive force of first-harmonic near number of times, therefore can the high-efficient operation induction motor, but on induction motor with the concentrated winding stator (base unit is 2 utmost points, 3 grooves) that is used for permanent-magnet motor more, owing to the anti-phase magnetomotive force near the first-harmonic number of times is arranged, so can not make the induction motor high-efficient operation.

At this, record and narrate about the magnetomotive force of the concentrated winding stator in the present embodiment.Concentrated winding stator in the present embodiment and the base unit that is used for permanent-magnet motor mostly are that the stator of 2 utmost points, 3 grooves is different, are that base unit is the stator of 1 utmost point, 3 grooves.That is to say, if 2 utmost points then become 6 grooves, if 4 utmost points then become 12 grooves.Table 4 illustrates the magnetomotive force high order harmonic component composition that base unit is the concentrated winding stator of 1 utmost point, 3 grooves.So far, equally first-harmonic is recited as 100%.Being that the stator of 2 utmost points, 3 grooves exists more magnetomotive force high order harmonic component near the first-harmonic number of times at the base unit that is used for permanent-magnet motor mostly relatively, is the magnetomotive force high order harmonic component that does not exist on the stator of 1 utmost point, 3 grooves near the first-harmonic number of times at base unit of the present invention.In addition, because to be that the magnetomotive force that stator produced is twined in 1 distribution identical with the groove number of the every extremely every phase shown in the table 2, thereby to obtain with the groove number of every extremely every phase as can be known be that the identical performance of stator is twined in 1 distribution.Therefore rotating induction motor efficiently.

Table 4

Number of times	The high order harmonic component composition is with respect to the ratio of first-harmonic
		First-harmonic	100％
2 times	0％
		3 times	0％
4 times	0％
		5 times	20.6％
6 times	0％
		7 times	15.2％
8 times	0％
		9 times	0％
10 times	0％

As previously discussed, be that the concentrated concentrated winding induction motor that twines stator of 1 utmost point, 3 grooves does not exist the high-efficiency harmonic near the first-harmonic number of times owing to have base unit, therefore can mainly improve power factor, make the induction motor high-efficient operation.In addition, by using the stator of concentrating canoe, can obtain to produce in batches characteristic height, little, the high such effect of occupation efficiency of coil-end.

Concentrated winding induction motor when 4 utmost points, 12 grooves based on execution mode 1 have been shown in Fig. 1 and Fig. 2, the concentrated winding induction motor when 6 utmost points, 18 grooves based on execution mode 1 have been shown in Fig. 3 and Fig. 4.

Execution mode 2

If the length of coil (copper cash) is L, the sectional area of coil is A _C, can distribute and twine the resistance R of induction machine ₁Can enough following formulas (3) calculate.

$R_1=\mathrm{\ρ}\frac{L}{A_C}---\left(3\right)$

As the long L of being of the coil of establishing every circle ₁, then above-mentioned L uses the groove of number of turn n, each phase to count Ns, becomes following formula (4).

L＝L ₁nN _S…(4)

Setting sub-external diameter is φ _d, coil diameter is 0.8 φ _d, when number of poles is p, distributes and twine the loop length L of the one-sided end winding of induction machine _EAs following formula (5), be carried out calculating.

$L_E=0.8\mathrm{\π}\frac{{\mathrm{\φ}}_d}{p}\×\frac{\mathrm{\π}}{2}---\left(5\right)$

Establishing whole groove areas is A _S, when duty ratio is σ, the relation of following formula (6) is set up.

$A_C=A_S\frac{\mathrm{\σ}}{N_{S}n}---\left(6\right)$

Utilizing these results, is L with the stator core length setting _C, resistance R then ₁, can as following formula (7), be tried to achieve.

${\mathrm{<figure-callout\; id="1"\; label="R"\; filenames="A20061010547600161.png,A20061010547600171.png"\; state="\{\{state\}\}">R</figure-callout>}}_1=\mathrm{\&rho;}\&times;2(L_C+L_E)n{N}_S\&times;\frac{N_{S}n}{A_S\mathrm{\&sigma;}}=2\mathrm{\&rho;}\frac{n^2{N}_S^2}{A_S\mathrm{\&sigma;}}(L_C+\frac{0.4{\mathrm{\&pi;}}^2}{p}{\mathrm{\&phi;}}_d)---\left(7\right)$

If the connection Len req is l, then distributes and twine the total length L of induction machine _SCan express with following formula (8).

$L_S=L_C+0.8\mathrm{\&pi;}\frac{{\mathrm{\&phi;}}_d}{p}+l---\left(8\right)$

Try to achieve equally and concentrate the resistance R of twining induction machine ₂With respect to the winding factor that twines induction machine that distributes is for 1, is 0.5 owing to concentrate the winding factor that twines induction machine, therefore in order to produce identical torque with identical electric current, must make the number of turn of 1 groove increase by 1 times.On the other hand, consider to concentrate the winding induction machine to compare 2 times occupation efficiency is arranged with the winding induction machine that distributes.Concentrate the loop length L of the one-sided end winding that twines induction machine in addition _EAs with following formula (9), being expressed.

$L_E=0.8\mathrm{\&pi;}\frac{{\mathrm{\&phi;}}_d}{N_S}---\left(9\right)$

The root a tree name these, the resistance R of concentrate twining induction machine ₂Can as following formula (10), calculate.And N _S=3p.

${\mathrm{<figure-callout\; id="2"\; label="R"\; filenames="A20061010547600151.png,A20061010547600211.png"\; state="\{\{state\}\}">R</figure-callout>}}_2=\mathrm{\&rho;}\&times;2(L_C+L_E)2n{N}_S\&times;\frac{N_S\&times;2n}{A_S\&times;2\mathrm{\&sigma;}}=2\mathrm{\&rho;}\frac{n^2{N}_S^2}{A_S\mathrm{\&sigma;}}(2L_C+\frac{1.6\mathrm{\&pi;}}{3p}{\mathrm{\&phi;}}_d)---\left(10\right)$

In addition, concentrate the total length L that twines induction machine _SBecome as following formula (11).

$L_S=L_C+0.8\mathrm{\&pi;}\frac{{\mathrm{\&phi;}}_d}{N_S}+l=L_C+0.8\mathrm{\&pi;}\frac{{\mathrm{\&phi;}}_d}{3p}+l---\left(11\right)$

Concerning induction machine and concentrated winding induction machine are twined in distribution, by stator core length and stator outer diameter, can understand favourable and adverse factors by these result of calculations.

When on distribute winding induction machine and concentrated winding induction machine the long Lc of stator core being equated, the induction machine total length concentrates the aspect of winding induction machine necessarily to diminish by the aforementioned calculation formula as can be known.And then because the little side's efficient of resistance improves, therefore when satisfying following formula (12), it is favourable concentrating winding induction machine aspect.

$2\mathrm{\&rho;}\frac{n^2{N}_S^2}{A_S\mathrm{\&sigma;}}(L_C+\frac{0.4{\mathrm{\&pi;}}^2}{p}{\mathrm{\&phi;}}_d)>2\mathrm{\&rho;}\frac{n^2{N}_S^2}{A_S\mathrm{\&sigma;}}(2L_C+\frac{1.6\mathrm{\&pi;}}{3p}{\mathrm{\&phi;}}_d)---\left(12\right)$

Put above-mentioned formula (12) in order, become following formula (13).

$L_C<\frac{6\mathrm{\&pi;}-8}{15p}\mathrm{\&pi;}{\mathrm{\&phi;}}_d---\left(13\right)$

That is, in the scope of formula (13), concentrate the winding induction machine to compare with the winding induction machine that distributes, can realize miniaturization and raise the efficiency this two aspect.

According to for this reason result of calculation up till now, when the torque that obtains equating with the electric current that equates, under the situation of stator core appearance etc., concentrate the induction machine total length of twining induction machine to shorten.Thus, on the contrary when the induction machine total length is equated, concentrate and twine induction machine stator core length is increased, under this state, can make its part electric current minimizing the torque that equates for producing with distributing to twine.Because it is relevant with the copper loss minimizing that electric current is reduced, so finally can raise the efficiency.

Each distributes and twines induction machine and concentrate the difference of the total length of twining induction machine such according to following formula (14).

$L_C+0.8\mathrm{\&pi;}\frac{{\mathrm{\&phi;}}_d}{p}+l-(L_C+0.8\mathrm{\&pi;}\frac{{\mathrm{\&phi;}}_d}{3p}+l)=\frac{8\mathrm{\&pi;}{\mathrm{\&phi;}}_d}{15p}---\left(14\right)$

That is, when the induction machine total length equates, concentrate the following formula (15) of stating of winding induction function to set its stator core length like that.

$L_C+\frac{8\mathrm{\&pi;}{\mathrm{\&phi;}}_d}{15p}---\left(15\right)$

Therefore, when producing identical torque, concentrate the electric current that twines induction machine doubly to realize with the formula (16) of twining the induction machine electric current that distributes.

$\frac{L_C}{L_C+\frac{8\mathrm{\&pi;}{\mathrm{\&phi;}}_d}{15p}}---\left(16\right)$

In sum, when satisfying following formula (17), concentrate the winding induction machine and can improve by small-sized formation efficiency with respect to the winding induction machine that distributes.

$2\mathrm{\&rho;}\frac{n^2{N}_S^2}{A_S\mathrm{\&sigma;}}(L_C+\frac{0.4{\mathrm{\&pi;}}^2}{p}{\mathrm{\&phi;}}_d)>2\mathrm{\&rho;}\frac{n^2{N}_S^2}{A_S\mathrm{\&sigma;}}(2(L_C+\frac{8\mathrm{\&pi;}{\mathrm{\&phi;}}_d}{15p})+\frac{1.6\mathrm{\&pi;}}{3p}{\mathrm{\&phi;}}_d)\&times;{\left(\frac{L_C}{L_C+\frac{8\mathrm{\&pi;}{\mathrm{\&phi;}}_d}{15p}}\right)}^2---\left(17\right)$

Become following formula (18) after putting above-mentioned formula (17) in order.

$L_C+\frac{0.4{\mathrm{\&pi;}}^2}{p}{\mathrm{\&phi;}}_d>(2(L_C+\frac{8\mathrm{\&pi;}{\mathrm{\&phi;}}_d}{15p})+\frac{1.6\mathrm{\&pi;}}{3p}{\mathrm{\&phi;}}_d)\&times;{\left(\frac{L_C}{L_C+\frac{8\mathrm{\&pi;}{\mathrm{\&phi;}}_d}{15p}}\right)}^2---\left(18\right)$

According to execution mode 2, under the situation that is 4 utmost points, 12 grooves, in 5A scope shown in Figure 5, seek efficient and improve or miniaturization, in 5AA scope shown in Figure 5, seek efficient and improve and miniaturization.In addition, under the situation that is 6 utmost points, 18 grooves, in 6A scope shown in Figure 6, seek efficient and improve or miniaturization, in 6AA scope shown in Figure 6, seek efficient and improve and miniaturization.

[execution mode 3]

As implement in the mode 1 illustrated, concentrated winding induction motor and the base unit that is used for permanent magnet motor mostly that has base unit and be the concentrated winding stator of 1 utmost point, 3 grooves is that the concentrated winding stator of 2 utmost points, 3 grooves is different, owing to do not have 2 times, 4 times magnetomotive force high order harmonic component, so can high-efficient operation.

Here, the pulsation (fluctuation) that is mostly torque when 5 times, 7 times magnetomotive force high order harmonic component is big just becomes big situation.Therefore, in the present embodiment,, can concentrate the running of twining induction motor more efficiently by reducing the magnetomotive force high order harmonic component 5 times.

5 times its wavelength of magnetomotive force high order harmonic component is 1/5 of a fundamental wavelength.For not influenced by these 5 magnetomotive force high order harmonic components, can make secondary conductor 8 skews of rotor 2.By electrical degree regulation fundamental wavelength is 360 degree and since the wavelength of 5 subharmonic be its 1/5, as make secondary conductor 8 skews of rotor 2 by its many times of electrical degrees, then the secondary conductor 8 of rotor 2 can reduce the influence of 5 magnetomotive force high order harmonic components that stator 1 produces.

Fig. 7 illustrates the sectional arrangement drawing of the concentrated winding induction electric machine rotor of embodiment of the present invention 3.7 is rotor cores, the 8th among the figure, secondary conductor, the 9th, and rotating shaft, the 10th, end ring, secondary conductor 8 is vertically with the electrical degree θ r skew of following formula.

θr＝360/5×n＝72×n

Here θ _r: the skew angle of rotor, n: natural number.

Specifically, with 72 degree, 144 degree, 216 degree ... the secondary conductor 8 of electrical degree skew rotor 2.

As mentioned above,,, can reduce the influence of 5 magnetomotive force high order harmonic components that stator produces, can obtain the little concentrated winding induction motor that fluctuates by the secondary conductor of electrical degree skew rotor with 72 degree integral multiples according to present embodiment.

Execution mode 4

In execution mode 3, because skew angle is more little, can produce more torques with same electric current more, therefore wish that skew angle is the smaller the better.Because setting is not subjected to the influence of 5 magnetomotive force high order harmonic components of stator generation, thus can make torque become big by secondary conductor with 72 degree electrical degree skew rotors, 5 magnetomotive influences of minimizing stator generation (it is big to fluctuate etc.).Fig. 8 illustrates the sectional arrangement drawing of the concentrated winding induction electric machine rotor of present embodiment.

Execution mode 5

As implementing to illustrate in the mode 1, concentrated winding induction motor and the base unit that is used for permanent-magnet motor mostly that has base unit and be the concentrated winding stator of 1 utmost point, 3 grooves is that 2 utmost points, 3 grooves concentrate that to twine stator different, since there is not the magnetomotive force high order harmonic component 2 times, 4 times, therefore can high-efficient operation.

Here, when 5 times, 7 times magnetomotive force high order harmonic components are big torque pulsation (fluctuation) just to become big situation more.Therefore, in the present embodiment,, can concentrate the running of twining induction motor efficiently by reducing the magnetomotive force high order harmonic component 7 times.

7 times its wavelength of magnetomotive force high order harmonic component is 1/7 of a first-harmonic.For avoiding the influence of these 7 magnetomotive force high order harmonic components, secondary conductor 8 that can skew rotor 2.If establish fundamental wavelength and be electrical degree 360 degree and since 7 subharmonic wavelength be its 1/7, if with the secondary conductor of its many times of electrical degree skew rotors, then the secondary conductor 8 of rotor 2 can reduce the influence of 7 magnetomotive force high order harmonic components of stator 1 generation.

Fig. 9 illustrates the concentrated winding induction electric machine rotor sectional arrangement drawing of embodiment of the present invention 5.In the drawings, 7 are rotor core, and 8 is secondary conductor, and 9 is rotating shaft, the 10th, and end ring.Secondary conductor 8 is vertically with the electrical degree θ r1 skew of following formula.

θr1＝360/7×n

Here, θ r1: the skew angle of rotor, n: natural number.

Particularly, with 51.4 degree, 102.9 degree, 154.3 degree ... the secondary conductor 8 of electrical degree skew rotor 2.

As mentioned above,,, the influence of 7 magnetomotive force high order harmonic components of stator generation can be reduced, the little concentrated winding induction motor of fluctuation can be obtained by being the secondary conductor of 360/7 degree integral multiple skew rotor with electrical degree according to present embodiment.

Execution mode 6

In execution mode 5, can produce more torque with same current more because skew angle is more little, so wish that skew angle is the smaller the better.Because set the influence of 7 magnetomotive force high order harmonic components that are not subjected to the stator generation, so, torque is become greatly by secondary conductor 8 with electrical degree 360/7 degree skew rotor 2, the influence of 7 magnetomotive force high order harmonic components that minimizing stator 1 produces (it is big to fluctuate etc.).Figure 10 illustrates the sectional arrangement drawing of the concentrated winding induction electric machine rotor of present embodiment.

Execution mode 7

Because limited groove in stator 1 will be so will produce groove high order harmonic component magnetic flux.This groove high order harmonic component magnetic flux and rotor 2 interlinkages cause the secondary copper loss of high order harmonic component and the iron loss of high order harmonic component.The secondary copper loss of high order harmonic component, the groove number of mover 2 be stator 1 groove number n doubly when (n is a natural number) for minimum, when the groove number of rotor 2 is (n-0.5) times of stator 1 groove number for maximum.In contrast, the high order harmonic component iron loss the groove number of rotor 2 when being n times of stator 1 groove number for maximum, when the groove number of rotor 2 is (n-0.5) times of stator 1 groove number for minimum.Therefore, be necessary to make these high order harmonic component losses to drop to minimum.

Figure 11 is an expression electric rotating machine high order harmonic component loss schematic diagram, is to be that example is represented to twine induction motor in the three-phase set of 4 utmost points.In addition, the groove number of stator 1 is 12 grooves.In Figure 11, ■ is the high order harmonic component secondary copper loss, and △ is the high order harmonic component iron loss, the 0th, and the high order harmonic component loss.And, usually owing to make the high order harmonic component loss, so the maximum of the maximum of high order harmonic component iron loss and high order harmonic component secondary copper loss is designed usually in same degree roughly for minimum.Along with the variation of rotor 2 groove numbers, also produce increase and decrease as the high order harmonic component loss of high order harmonic component secondary copper loss and high order harmonic component iron loss sum.In Figure 11, though the maximum of high order harmonic component secondary copper loss is bigger than the maximum of high order harmonic component iron loss, its magnitude relationship changes with various key elements such as the tapering (grade) of rotor core 7 and frequencies.Yet the minimum value that is clear that very much the high order harmonic component loss is the peaked separately centre that is in high order harmonic component secondary copper loss and high order harmonic component iron loss.

That is the groove number of rotor 2 is that roughly (0.5n+0.25) of stator 1 groove number becomes minimum near doubly as can be known, therefore, is N if set the groove number of son 1 _S, the groove number of rotor 2 is N _r, then satisfy following formula as can be known

N _S×(0.5n+0.25)-1≤N _r≤N _s×(0.5n+0.25)+1

The high order harmonic component loss diminish N wherein _r, n is natural number.

In addition, if the groove number that makes rotor near N _S* (0.5n+0.25) natural number, then the high order harmonic component loss becomes minimum.

And then, when the number of poles of stator 1 is 4 utmost points, be made as 9 or 15 by groove number with rotor 2, then the loss of the high order harmonic component of Figure 11 becomes minimum.

In the explanation of above-mentioned execution mode,, so long as have and the electric rotating machine of the same structure of above-mentioned explanation, also can obtain same effect even be applied to other electric rotating machine such as induction generator though for example understand induction motor.

Claims (10)

1, a kind of electric rotating machine is characterized in that, comprising:

Stator, this stator is with concentrated canoe winding around on a plurality of teeth that are set in the stator core, and above-mentioned coil is connected with three phase mains;

Rotor, the relative configuration of above-mentioned tooth of this rotor and said stator,

Wherein, the number of poles of said stator is 1: 3 with the ratio of groove number.

2, electric rotating machine as claimed in claim 1 is characterized in that:

Long Lc of stator core and stator outer diameter φ _dRelation satisfy following formula,

$L_C+\frac{{0.4\mathrm{\&pi;}}^2}{p}{\mathrm{\&phi;}}_d>(2(L_C+\frac{8{\mathrm{\&pi;\&phi;}}_d}{15p})+\frac{1.6\mathrm{\&pi;}}{3p}{\mathrm{\&phi;}}_d)\&times;{\left(\frac{L_C}{L_C+\frac{{8\mathrm{\&pi;\&phi;}}_d}{15p}}\right)}^2$

Wherein p is a stator poles.

3, electric rotating machine as claimed in claim 1 is characterized in that:

Long Lc of stator core and stator outer diameter φ _dRelation satisfy following formula,

$L_C<\frac{6\mathrm{\&pi;}-8}{15P}{\mathrm{\&pi;\&phi;}}_d$

Wherein p is a stator poles.

4, as any one described electric rotating machine in the claim 1～3, it is characterized in that:

To be formed on secondary conductor on the above-mentioned rotor with respect to the electrical degree of the about 72 * n degree of direction of principal axis skew, wherein n is a natural number.

5, as any one described electric rotating machine in the claim 1～3, it is characterized in that:

Be formed on the above-mentioned rotor secondary conductor with respect to axial skew about 72 the degree electrical degree.

6, as any one described electric rotating machine in the claim 1～3, it is characterized in that:

With the secondary conductor about 360/7 * n degree of the skew electrical degree vertically that is formed on the above-mentioned rotor, wherein n is a natural number.

7, as any one described electric rotating machine in the claim 1～3, it is characterized in that:

Be formed on the above-mentioned rotor secondary conductor vertically skew about 360/7 the degree electrical degree.

8, as any one described electric rotating machine in the claim 1～3, it is characterized in that:

Groove number in said stator is Ns, and the groove number of above-mentioned rotor is under the situation of Nr, satisfies Ns * (0.5n+0.25)-1≤Nr≤Ns * (0.5n+0.25)+1.

9, as any one described electric rotating machine in the claim 1～3, it is characterized in that:

Groove number in said stator is under the situation of Ns, makes the groove of above-mentioned rotor count Nr for approaching most the natural number of Ns * (0.5n+0.25).

10, as any one described electric rotating machine in the claim 1～3, it is characterized in that:

Number of poles in said stator is under the situation of 4 utmost points, and the groove number of above-mentioned rotor is 9 or 15.

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